Cutout for electric irons



July 25, 1944 A. R. Hr-:ESEMAN 2,354,575

CUTOUT FOR ELECTRIC IRONS Filed Dec. 25, 1941 Patented July 25, 1944 2,354,575 cU'roU'r Foa ELECTRIC moNs Albert Randolph Cheeseman, Toronto, Ontario, Canada Application December 23, 1941, Serial No. 424,095

1 Claim.

My invention relates to improvements in cutouts for electric irons, and the object of the invention is to devise means for automatically, instantly and permanently cutting out the current when the temperature has reached a pre-` the cover being shown by dotted lines to exhibit the construction of my cut-out.

Fig. 2 is a plan of the cut-out mechanism showing the element winding in diagram.

Fig. 3 is an enlarged sectional vew through one of the insulated binding posts.

In the drawing like reference characters indicate corresponding parts in the different views.

I is the body of the iron, 2 the cover shown mostly by dotted lines. l indicates the winding of the element provided with terminals 4 and 8. 6 is an expansion rod set freely in a bored oriilce 1 formed in the iron body. 8 is a lever pivoted at 9. I0 and II are the post terminals of the iron carried by the cover thereof in the usual I0x is a set screw carried by the end of the lever 8 andv provided with a set nut IIx threaded thereon. I2 is a hook latch pivoted at I3 and connected to the nut Ilx by a wire li. I4 is a spring finger secured at II to the iron body and engaged by the latch I2 at its free end. `By adjusting the set screw the temperature at which the latch disengages is controlled. f

I6 is a knob located at the outside of the cover 2 and provided with a stem I'I extending through a small orice I8 formed in the cover and connected to the spring I4'by an insulating connection I8. 28 is an arm extending from the connection I8. 2I and 22 are standards provided with base plates 23 and 24 which are insulated from the iron.

l is a metallic insulated contact provided with an arm 28 from which extends a vertical contact pin 21. 28 is a rod from which extends a contact arm 2i engaging the pin 21 and a crank arm 80 pivotally connected to the arm 28.

II represents in diagram the socket connecting the posts Il and II. terminallandplateu. Ilisawireconnecting the contact 28 with the insulated binding post I2 is awire connecting the 34 having the metallic connection 35 to the post I I of the iron cover.

The parts 23, 24, 25 and 34 are all insulated from the iron body in a manner similar to that indicated in Fig. 3 and comprising the-insulat ing sleeves 36 and washers 31 and 38 through which the screw 39 extends into the body.

In operation the ilnger I4 and latch I2 are in engagement. l

As the temperature rises, the rod 8 expands forcing the lever 8 outwardly exerting a pull through the set screw Ix, set nut IIx and wire II on the latch I3 which is thereby drawn out of engagement with the finger I4. The finger then springs up rocking the rod 28 to carry the contact arm 28 out of engagement with the contact pin 21 thus breaking the circuit.

This circuit remains broken until it is manually closed by pressing the knob I8 so as to reengage the ilnger with the latch I2 and complete the circuit.

The circuit extends from one terminal 4 of the element winding to the post I0, then by socket 3| to post II, then by the metallic connection I5 to the post 34 and thence by wire 33 to contact 25 andY pin 2'I to contact arm 29 and rod.28 returning by wire 32 to the other terminal 5 of the element winding 3.

From this description it will be seen that I have devised a cut-out which will operate rapidly to open the circuit which will then remain open until closed by manual pressure on the knob I8.

What I claim as my invention is:

. In an electric iron or other heated device having a heating element and terminals therefor, a thermostatic switch Vcomprising a spring nnger. a crank rod of conducting material mounted in suitable bearings one of which forms one termi- `nal of theelement. a crank arm extending from the rod and depressed by the depression of the spring iinger to rotate the rod, a pin forming the other terminal of the element, a contact arm also extending from the crank rod to engage the pin and adapted to break contact therewith when the crank rod is rotated by the depression of the spring nger, a spring pressed pivoted latch for engaging the end of the spring finger to hold it in the depressed position. and automatic means for operating the latch to free the linger as the temperature of the element rises to maximum and means for the latch and nger as the element cools. l

ALBERT RANDOLPH C. 

